9 Appendix B Battery selection calculations
This appendix describes the method for selecting the properly sized sealed lead-acid battery for the required standby time.
Standby Current
Main (system) board: 100mA
Each relay board: 20mA
Note:
Standby current is the sum of all module currents, plus auxiliary 24V current.
For ULC applications, the maximum standby current is 351mA.
Alarm Current
Main (system) board: 140mA
Each relay board: 70mA
Alarm current is the sum of all module currents, plus auxiliary 24V current, plus NAC and RAC current.
For ULC applications, the maximum alarm current is 3.541A.
Note:
Alarm current is the sum of all module currents, plus auxiliary 24V current.
For ULC applications, the maximum standby current is 351mA.
9.1 Battery Selection Calculations
9.1.1 11 Steps to battery selection
From previous calculations, locate total Standby Current (A) and convert to amperes A = ______
(Note: amperes = mA ÷ 1000; µA ÷ 1,000,000; examples: 250 mA = 0.25 A; 1500 µA = 0.0015 A)
Identify Standby Time (C), in hours. C = ______ (typically 4, 24, 48, or 60 hr)
From previous calculations, locate total Alarm Current (B) in amperes. B = ______
Identify Alarm Time (D) in minutes. D = ______ (typically 5, 10, or 15 min)
Using the values in Steps 1-4, perform an Initial Battery Calculation per the following: (A x C) + (0.0167 x B x D) = _______ Ah (Ah = ampere
hours)
Select a battery size LARGER than the number from the Initial Battery Calculation from the list of batteries using the 20 Hour Rating value.
See Table 20 for information.
Table 20: Initial calculation based on 20 hour rating
20 Hour Rating C/20 (Amps) 20 Hour Rating C/20 (Amps) 20 Hour Rating C/20 (Amps)
1.3 Ah 0.065 6.2 Ah 0.31 25 Ah 1.25
2.2 Ah 0.11 7.0 Ah 0.35 26 Ah 1.30
3.0 Ah 0.15 7.2 Ah 0.36 33 Ah 1.65
3.4 Ah 0.17 10 Ah 0.50 35 Ah 1.75
4.0 Ah 0.20 12 Ah 0.60 50 Ah 2.5
page 58 579-354 Rev. X
4004R Fire Alarm installation, programming, and operating instructions
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